marvelous - adj. extremely good or enjoyable; wonderful​

environmentalist – n. a person who works to protect the natural world from pollution and other threats

high tide – n. the tide when the water is at its highest level

landscape – n. an area of land that has a particular quality or appearance

sewage – n. waste material such as human urine and feces that is carried away from homes and other buildings in a system of pipes

What do you think Rio de Janeiro should do to clean up Guanabara Bay? Write to us in the comments section.